100 HR INSPECTION REQUIREMENT EXCEEDED DURING A PLT TRAINING FLT IN A C172. FLT INSTRUCTOR RPTR OBSERVED ACFT INSPECTION STATUS BOARD AND COMMERCIAL RATED STUDENT PREFLT INSPECTION OF THE ACFT FOR ASSURING THAT THE ACFT WOULD BE WITHIN TIME LIMITS. THE PLANNED FLT WAS EVEN SHORTENED UPON DISCOVERY THAT THERE WAS LESS TIME AVAILABLE THAN ORIGINALLY PLANNED.

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APPROX 1 HR BEFORE AN INSTRUCTIONAL FLT I TELEPHONED MY OFFICE TO INQUIRE IF OUR ACFT WAS IN COMMISSION AND I; AT THAT POINT; HEARD 'YES IT WAS 2 HRS LEFT ON THAT PLANE.' ON ARR AT THE OFFICE I CHKED THE FLT PLAN CLIPBOARD FOR THE ACFT TO SEE IF ANYBODY HAD FLOWN OR REDFLAGGED THE ACFT TO GND IF SOME DISCREPANCY. (FLT PLANS ARE MANDATORY AT THIS LOCATION BY GOV REG -- NOT FAA.) IT HAD NOT BEEN FLOWN OR FLAGGED. I THEN CHKED THE FLT SCHEDULE TO SEE IF THE ACFT WAS SCHEDULED TO US AND TO SEE IF A CAPITAL 'A' WITH A LINE THROUGH IT; INDICATING A GNDED ACFT. THERE WAS NO 'A' AND THE PLANE WAS SCHEDULED TO US FROM XA00 TO XC00 LCL. I THEN CHKED A PLEXIGLAS MAINT BOARD FOR TIME REMAINING TO 100 HR INSPECTION OR ANNUAL. I BELIEVED IT SHOWED 8.2 HRS TO 100 HR INSPECTION; IT IN FACT HAD A SMALL SMUDGED 1 IN FRONT OF 8.2 SHOWING 18.2 HRS UNTIL INSPECTION. I THEN FOUND MY STUDENT; A COMMERCIAL; INST; MULTI-ENG RATED PLT; WHO IS ALSO A GND EMPLOYEE OF A PART 135 FREIGHT OPERATOR AS A FUELER AND LOADER; GOING OVER OUR ACFT'S TIME LOG SHEETS; SQUAWK SHEETS AND INSPECTIONS BOOK. I LOOKED OVER AND QUESTIONED HIM ABOUT THE ANNUAL; PITOT STATIC; ELT; XPONDER; ENCODER INSPECTIONS AND THE TACH TIME THE 100 HR INSPECTION WAS DUE I ASKED HIM HOW LONG UNTIL THE 100 HR INSPECTION WAS DUE; HE REFERRED BACK TO THE ACFT FLT TIME SHEET SINCE LAST INSPECTION AND CALCULATED ABOUT 1.8 HRS. I HAD FILED A FLT PLAN FOR 2 HRS 15 MINS AND AT THIS POINT I MADE A MENTAL NOTE TO SHORTEN OUR FLT LESSON ELIMINATING 1 ARPT IN THIS LCL AREA FAMILIARIZATION FLT; AS THE STUDENT IS NEW TO THIS AREA. A CHK WITH THE FSS INDICATED VFR CONDITIONS AND NO PROBS WITH NOTAMS. WE THEN PROCEEDED TO THE ACFT ABOUT A MI FROM THE OFFICE. HE NOTICED A DIFFERENCE FROM ACTUAL STOP TIMES AND WHAT WAS LOGGED; HE LOGGED THE ACTUAL TIMES AND I MADE ANOTHER MENTAL NOTE TO ELIMINATE A LITTLE MORE OF MY LESSON PLAN TO GET US BACK ON TIME. AFTER A GOOD PREFLT; A NORMAL RUNUP BY THE CHKLIST; WE DEPARTED THE CLASS B AIRSPACE AND PROCEEDED WITH A NORMAL LCL AREA FAMILIARIZATION AND EVAL FLT. I ENDED UP ELIMINATING 2 ARPTS AND A TOUR OF OUR DESIGNATED GND REF MANEUVER AREA. THE NEXT DAY; NOV/THU/96 I WAS APCHED BY MGMNT OF THIS SCHOOL WHERE I AM A CONTRACTED INSTRUCTOR WHILE IN THE COMPANY OF ANOTHER STUDENT. I WAS ASKED IF I AND THE STUDENT HAD DELIBERATELY DEPARTED AND OVERFLEW THE 100 HR INSPECTION. I WAS THEN SHOWN A TIME LOG SHEET THAT SHOWED WE HAD. SOME INDIVIDUAL HAD EITHER FLOWN OR MADE AN EXTENDED GND ENG AND DID NOT LOG IT RESULTING IN LESS TIME UNTIL INSPECTION. THE STUDENT ALSO APPARENTLY MADE A MISTAKE IN SUBTRACTION OF TIMES; COMBINING TO YIELD AN OVERFLT OF 1.7 HRS; IF THE LOGSHEET IS ACCURATE. ABOUT 1 1/2 HRS LATER; ON NOV/THU/96; I FOUND THE KEYS TO THE ACFT STILL AVAILABLE. THE ACFT STILL HAD NOT BEEN LINED OUT ON THE SCHEDULE -- IT WAS NOT REDFLAGGED GNDED ON THE FLT PLAN BOARD AND THE MAINT STATUS BOARD SHOWED; AS THIS OTHER PLT WITH ME ON NOV/WED/96 HAD TO POINT TO ME; 18.2 HRS UNTIL INSPECTION. THIS PLT HAD TO POINT THIS OUT TO ME BECAUSE I WAS VERY UPSET AFTER THE ABOVE DESCRIBED CONFRONTATION AND THE THOUGHT OF FAA VIOLATION. IN OVER 10 YRS AND 2000 HRS OF FLT INSTRUCTION I HAD NEVER KNOWINGLY OR WILLINGLY VIOLATED THE FARS. AT THIS POINT I DID NOT HAVE MY MIND PROPERLY ON THE FLT WITH OTHER PLT ON NOV/THU/96. I TOLD HIM SO AND CANCELED OUR FLT AND DID NOT SCHEDULE MYSELF TO FLY THE NEXT DAY AS WELL.